The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 25, 2026
Filed:
Sep. 29, 2021
Evonik Operations Gmbh, Essen, DE;
Nicolai Kolb, Marl, DE;
Kai-Steffen Krannig, Dortmund, DE;
Jürgen Hellwig, Schwerte, DE;
Matthias Bahlmann, Borken, DE;
Alexander Pschantka, Coesfeld, DE;
Philip Kemper, Ahaus, DE;
EVONIK OPERATIONS GMBH, Essen, DE;
Abstract
The present invention relates to a process for preparing hydroxy-functionalized polydiene, preferably polybutadiene or polyisoprene, by reacting monomer diene with hydrogen peroxide in the presence of a hydrophilic organic solvent, wherein the total amount of monomer diene used is added to the reaction in at least two parts, wherein the second part of the monomer diene is added to the reaction at a temperature of the reaction mixture that is at least +5 K different from the temperature of the reaction mixture at the addition of the first part of the monomer diene, to hydroxy-functionalized polybutadiene, having a dispersity index D below 2.7, a viscosity at 30° C. below 3200 mPa*s, an OH-number of from 50 to 90, a number average molecular weight Mn of from 1.6 to 2.5 kDa, and a weight number average molecular weight Mw of from 4.0 to 5.6 kDa. and comprising the monomer units derived from 1,3-butadiene in a specific ratio, and use of the hydroxy-functionalized poly butadiene, for the production of polyurethane-based thermo- or electro-insulation, adhesives or sealants or polyesters.